JPH11334592A - Truck frame for rolling stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax stress concentration generated to a connection part between a side beam and a cross beam by providing reinforcing ribs arranged on both sides of the connection part between the side beam and the cross beam, in positions not longer than the closer distance out of the distance from the connection part to the upper face or lower face of the side beam so as to disperse stress. SOLUTION: In a rolling stock truck frame 1 with side beams 2 connected by a cross beam 3, reinforcing ribs 4 provided on both sides of the side beam 2 at a connection part P between the side beam 2 and the cross beam 3 are provided in the positions of distance L2 equal to or shorter than closer distance L1 out of the distance from the connection part P to the upper face or lower face of the side beam 2. With the reinforcing ribs 4 provided in such positions, the whole connection part P bears load, so that generated stress can be balanced. In this truck frame 1, the reinforcing ribs 4 are not only brought close to the connection part P but also can be formed in curved shape so as to be a concentric circle with the cross beam 3, or a plurality of reinforcing ribs 4 can be provided in the same condition, which further reduces generated stress.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bogie frame for a railway vehicle capable of reducing stress concentration at a joint between a side beam and a cross beam and improving durability.

[0002]

2. Description of the Related Art As shown in FIG. 5, a bogie frame of a railway vehicle has a structure in which a central portion between a pair of side beams 11 arranged at a predetermined interval is connected by, for example, two cross beams 12. Yes,
During traveling, the vehicle bears not only vertical loads for supporting the vehicle body but also loads such as front and rear, left and right, and torsion.

In the bogie frame having such a configuration, the cross beam 12
When the load is transmitted between the side beam 11 and the side beam 11, if the load is evenly distributed over the entire joint portion P between the side beam 11 and the side beam 12, stress concentration does not occur. The upper surface and the lower surface of the side beam 11 are located near the joint P of the side beam 11, so that even if the side surfaces of the side beam 11 and the plate thickness of the cross beam 12 are constant, the upper surface and the lower surface of the side beam 11 It will have strength.

As described above, when a load is applied to a structure whose strength is not uniform in structure, a large load is borne at a portion where the strength is high. Will bear a large load.

[0005] On the other hand, even though the structural strength is different at the joint between the side beam and the cross beam, a high stress is generated in accordance with the ratio of the load burden because the side beam itself has a constant thickness. It can be said that. Also, since the cross beam bears an uneven reaction force, a large load is applied to an upper portion and a lower portion in the vicinity of a joint between the side beam and the cross beam, and a high stress is generated. Therefore, when the load such as the front and rear, right and left twists acts on the bogie frame, stress concentration occurs near the upper and lower portions of the joint between the side beam and the cross beam.

Therefore, in order to reduce the high stress below the fatigue limit strength of the bogie frame, conventionally, as shown in FIG. 6 and FIG.
Although not shown, a large number of welding beads were attached to the side beams and the cross beams, particularly near the upper and lower portions, to thereby firmly join them to reduce the nominal stress.

For the purpose of improving the strength of the bogie frame against such stresses, for example, Japanese Patent Application Laid-Open No. 9-30417 discloses a pedestal chin area of a light-weight side beam having a solid and open integrated I-beam sectional shape. A light-weight side beam for a bogie and a bogie for improving the mechanical strength against twisting of the side beam by providing a reinforcing member as a brace means.

[0008]

As described above, conventionally,
The configuration was designed to withstand stress by placing a weld bead near where stress concentration occurs or by adding a vague reinforcement member to the outer surface of the joint between the side beam and the cross beam. This has not been eliminated, and stress concentration still occurs at the joint between the side beam and the cross beam.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a railway vehicle capable of reducing stress concentration itself occurring near the upper and lower portions of a joint between a side beam and a cross beam. It is intended to provide a bogie frame.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention does not provide vaguely the reinforcing ribs provided on both sides of the side beam at the joint with the cross beam. The stress is dispersed at a position that is smaller than the shorter distance of the distance to the lower surface. This alleviates the concentration of stress generated at the joint between the side beam and the cross beam.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the bogie frame for a railway vehicle according to the present invention, reinforcing ribs provided on both sides of a connecting portion of a side beam with a horizontal beam are provided with reinforcing ribs which are closer to the upper surface or the lower surface of the side beam. It is provided at a position less than the distance.

As described above, the reinforcing ribs provided on both sides of the joint between the side beam and the cross beam reduce the unevenness in structural strength by approaching the joint, and the upper and lower portions of the joint between the side beam and the cross beam are reduced. As a result, the load that has been borne by having a large strength can be made closer to a uniform state, thereby alleviating the stress concentration on the structure.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bogie frame for a railway vehicle (hereinafter abbreviated as a bogie frame) according to the present invention will be described below with reference to FIGS. FIG. 1 shows an arrangement relationship between side beams, cross beams, and reinforcing ribs in the bogie frame of the present invention. FIG. 2 shows a model around the joint between the side beam, the cross beam, and the reinforcing rib in the bogie frame of the present invention. FIG. 3 shows the stress calculation locations near the joints of the bogie frames according to the experiment. FIG. 4 is a graph showing the calculation results in FIG.

As shown in FIGS. 1 and 2, the bogie frame 1 of the present invention comprises reinforcing ribs 4 provided on both sides of the side beam 2 at the joint P between the side beam 2 and the side beam 3. Joint P of 3
It is provided at a position that is the same or shorter distance L2 as the shorter distance L1 of the distance from to the upper surface or the lower surface of the side beam 2.

If the reinforcing ribs 4 are provided at such positions, the load is borne by the entire joint P, so that the generated stress is balanced. In addition, the bogie frame 1 of the present invention
In addition to bringing the reinforcing ribs 4 closer to the joint portion P, the reinforcing ribs 4 may be formed in a curved shape concentric with the cross beam 3 or by providing a plurality of reinforcing ribs 4 under the above conditions.
Further, the generated stress can be reduced.

Incidentally, a model around the joint between the side beam 2, the cross beam 3 and the reinforcing rib 4 of the bogie frame 1 of the present invention shown in FIG. 2 and the side beam 11 and the cross beam 12 of the conventional bogie frame shown in FIG. The results obtained by performing calculations under the following conditions for a model around the joint between the reinforcing rib 13 and the reinforcing rib 13 are shown below.

For example, the side beams 2, 11 in FIGS. 2 and 7 are 300 mm wide × 300 mm high × 15 mm thick,
2 is 150 mm in outer diameter × 15 mm in wall thickness, and both are made of the same material. In the present invention shown in FIG. 2, a reinforcing rib 4 is provided at a position where L2 is 142.5 mm when L1 is 142.5 mm (L2 ≦ L1). In the conventional example shown in FIG.
When Lb is 172.5 mm at 5 mm (La <L
b), a reinforcing rib 13 is provided, and both side beams 2 and 11 are fixed, and a torsional load of 1000 kgf / mm is applied to the cross beams 3 and 12 so that A, B, and C of the joints P as shown in FIG. , D were calculated.

As a result of the calculation, in the conventional bogie frame shown in FIG. 7, a considerably high stress was generated mainly at two points A and C of the joint P as shown by a broken line in FIG. In contrast, FIG.
The truck frame 1 of the present invention shown in FIG.
The stress generated at B and D of the joint P is higher than that of the conventional one, but the stress generated at A and C of the joint P is lower than that of the conventional one, , B, C and D as a whole, the generated stress itself was averaged and was suppressed lower than that of the conventional one.

As is apparent from the above calculation, as in the present invention, the reinforcing rib 4 is connected to the shorter one of the distances from the joint P between the side beam 2 and the cross beam 3 to the upper surface or the lower surface of the side beam 2. At a position that is the same as or shorter than the distance L1, or L2,
If provided so as to satisfy 2 ≦ L1, the stress that the upper and lower portions of the joint P excessively bear is dispersed, and the stress concentration can be reduced.

[0020]

As described above, in the bogie frame for a railway vehicle according to the present invention, the reinforcing ribs provided on both sides of the connecting portion of the side beam with the cross beam are included in the distance from the connecting portion to the upper surface or the lower surface of the side beam. Since it is provided at a position that is shorter than the shorter distance, the stress concentration at the joint between the side beam and the cross beam is alleviated, and the stress concentration itself generated near the upper and lower parts of the joint between the side beam and the cross beam is reduced. Therefore, durability can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing an arrangement relationship among side beams, cross beams, and reinforcing ribs in a bogie frame for a railway vehicle according to the present invention.

FIG. 2 is a view showing an arrangement model of side beams, cross beams, and reinforcing ribs in the bogie frame for a railway vehicle according to the present invention.

FIG. 3 is a diagram showing stress calculation locations at joints between side beams, cross beams, and reinforcing ribs by an experiment.

FIG. 4 is a diagram showing a result of stress calculation at a joint between a side beam, a cross beam, and a reinforcing rib.

FIG. 5 is a diagram showing a schematic configuration of a conventional bogie frame for a railway vehicle.

FIG. 6 is a view showing an arrangement relationship among side beams, cross beams, and reinforcing ribs in a conventional bogie frame for a railway vehicle.

FIG. 7 is a view showing an arrangement model of side beams, cross beams, and reinforcing ribs in a conventional bogie frame for a railway vehicle.

[Explanation of symbols]

Reference Signs List 1 (railroad vehicle) bogie frame 2 side beam 3 side beam 4 reinforcing rib P connection part L1 The shorter distance from the connection part between the side beam and the side beam to the upper surface or lower surface of the side beam L2 Same or close distance to L1

Claims (1)

[Claims] In a bogie frame for a railway vehicle in which side beams are connected by a cross beam, reinforcing ribs provided on both sides of a connection portion of the side beam with the cross beam are included in a distance from the connection portion to an upper surface or a lower surface of the side beam. A bogie frame for a railway vehicle, wherein the bogie frame is provided at a position which is shorter than or equal to a shorter distance.